Product Description
Milwaukee MW801 PRO 3-in-1 Combo Meter: Professional pH, EC & TDS Testing
The Milwaukee MW801 PRO is a professional-grade combo meter that measures pH, electrical conductivity (EC), and total dissolved solids (TDS) with a single integrated probe. Designed for aquariums, hydroponics, drinking water testing, and aquaponics, this meter delivers lab-quality accuracy in a portable, rugged package.
Key Benefits
3-in-1 Testing: Measure pH, EC, and TDS with one meter and one probe—no juggling multiple devices
Lab-Grade Accuracy: ±0.2 pH accuracy ensures reliable, professional results
Automatic Temperature Compensation (ATC): Built-in temperature correction for consistent readings
Replaceable SE600 Probe: Fiber junction design resists fertilizer contamination, extends probe life
Simple Calibration: Easy single-point manual calibration for both pH and EC
Rugged & Portable: Lightweight (5.8 oz) with large, easy-to-read display
Why Choose the MW801 PRO?
pH and TDS levels are critical for water quality in aquariums, hydroponics, and drinking water. High TDS can reduce water clarity, affect taste, and impact fish health and aquatic plant photosynthesis. The MW801 PRO gives you precise control over water chemistry with professional accuracy and exceptional ease of use.
What Customers Say
"Superb meter, easy to use, great customer service."
"Best meter I have ever owned."
"I have owned this meter for almost 8 years and only replaced the probe once. The calibration knobs are easy to use, and even when I am less than gentle with the thing it keeps on going. I wouldn't consider any other meter."
"The best meter on the market and Milwaukee customer service is the best."
Technical Specifications
pH Range: 0.0 to 14.0 pH | Resolution: 0.1 pH | Accuracy: ±0.2 pH
EC Range: 0 to 1990 µS/cm | Resolution: 10 µS/cm | Accuracy: ±2% FS
TDS Range: 0 to 1990 ppm | Resolution: 10 ppm | Accuracy: ±2% FS
Temperature Compensation: Automatic, 32-122°F (0-50°C)
Probe: SE600 combination pH/EC/TDS probe with 3-foot cable
Calibration: Manual 1-point for pH & EC
Battery: 1 x 9V alkaline (150 hours life)
Dimensions: 7.3 x 3.2 x 1.8 inches (185 x 82 x 45 mm)
Weight: 0.36 lbs with battery (0.165 kg)
Conversion Factor: 0.5
Applications
Aquarium water quality monitoring
Hydroponic nutrient management
Drinking water testing
Aquaponics systems
Wastewater analysis
Laboratory testing
Care & Maintenance
The SE600 probe includes both pH and EC sensors. pH sensors have a limited lifespan and require proper maintenance for optimal performance. Follow these best practices:
Storage: Always store with cap full of buffer or storage solution (never water)
Cleaning: Soak probe regularly in cleaning solution to remove residue
Calibration: Calibrate after cleaning and storage before testing
Testing: Gently stir probe in sample for faster, more accurate results
Recommended: Order the Milwaukee pH Maintenance Kit (code PH-Main) to clean and condition your electrode for peak performance.
What's Included
MW801 PRO meter
SE600 combination pH/EC/TDS probe
9V battery
Calibration solutions: M10007B (pH 7.01), M10031B (1413 µS/cm), M10080B (800 ppm)
Instruction manual
Why Milwaukee Instruments?
Milwaukee Instruments is trusted worldwide for professional-grade water testing equipment. The MW801 PRO combines Milwaukee's reputation for rugged construction, long-term reliability, and exceptional customer service—backed by years of proven performance in demanding applications.
